-18x2 -2x +16 = 0
ax2 bx c = 0
a = -18
b = -2
c = 16
Δ = b2-4ac
Δ = -2² - (4 * -18 * 16)
Δ = 4 - (4*-288)
Δ = 4 - (-1152)
Δ = 1156 Δ > 0
-18x2-2x+16=0
x = -b ∓ √Δ 2a
x' = 2 - √1156 2*-18 = 2 - 34.0 -36 = -32.0 -36 = 0.888888888889
x" = 2 + √1156 2*-18 = 2 + 34.0 -36 = 36.0 -36 = -1.0
x' = 288.0
x" = -324.0
S = {x ∈ R / x' = 288.0, x" = -324.0 }